Ilya Ioslovich - Profile on Academia.edu (original) (raw)
Papers by Ilya Ioslovich
Problems of optimal control of cyclic processes
Soviet journal of computer and systems sciences
Neural networks for dynamical crop growth model reduction and optimization
Artificial Neural Nets and Genetic Algorithms, 1995
A dynamic crop growth model of undeterminate tomato variety (TOMGRO) consists of a large number (... more A dynamic crop growth model of undeterminate tomato variety (TOMGRO) consists of a large number (69) of difference equations that describe age classes of different organs. In order to find a fast working and low-dimensional equivalent with dynamic Neural Networks (NN), several model reduction approaches has been tried, including aggregation, PCA transformation, and bottleneck NN compression. Reduced data were used to train dynamic NN. Simulations with the NN model produced trajectories which agreed well with the original trajectories of TOMGRO.
Optimal CO2 Enrichment of Greenhouses in Mild Climates
Acta Horticulturae, 1997
Proceedings of the 11th International Conference on Informatics in Control, Automation and Robotics, 2014
Traffic flow control has motivated many researchers since early decades of the 19th century. Rece... more Traffic flow control has motivated many researchers since early decades of the 19th century. Recently, the concept of a perimeter traffic control for an urban region has been strengthened by a series of works, which have shown that a perimeter controller, located at a region border, can manipulate the transfer flows across the border to maximize the total outflow of the region. The macroscopic fundamental diagram (MFD), that relates average flow with accumulation, is used to model the traffic flow dynamics in the region. Assuming that the control inputs of the cross-border flows are coupled, i.e. the border is always utilized over time for transferring flows by one of the two directions (from and towards the region), and that the urban region has two traffic flow demands generated inside the region with internal and external destinations, and a generated traffic flow outside the region with a destination to the region, the explicit formulation of the optimal feedback control policy and a proof of optimality are provided. The proof is based on the modified Krotov-Bellman sufficient conditions of optimality, where the upper and lower bounds of state variables are calculated.
Optimal control of the rotation of an axisymmetric rigid body: the general case
Control applications of optimization 1995: a postscript …, 1996
Abstract The problem of an axisymmetric rigid body angular velocity vector maneuvering in the bod... more Abstract The problem of an axisymmetric rigid body angular velocity vector maneuvering in the body-fixed frame is considered. Control actuators are provided by two pairs of reactive jets with constant directions of their torques. Characteristics of these jets could be unequal. The time of the process of a transfer from the initial to the end point in the body-fixed frame of angular velocities is not prescribed. Both initial and end points could be arbitrary but given in advance. The problem is solved in the closed analytical form. Sufficient conditions of optimality are used.
On the botanic model of plant growth with intermediate vegetative-reproductive stage
Theoretical population biology, 2005
The application of dynamic optimization to mathematical models of ontogenic biological growth has... more The application of dynamic optimization to mathematical models of ontogenic biological growth has been the subject of much research [see eg Cohen, 1971. J. Theor. Biol. 33, 299307]. Kozłowsky and Ziółko [1988. Thor. Popul. Biol. 34, 118129] and Ziółko and ...
Combined time and energy optimal trajectory planning with quadratic drag for mixed discrete-continuous task planning
Optimization
Combined time and energy optimal trajectory planning with quadratic drag for mixed discrete-continuous task planning
Optimization
Assimilation of canopy cover and biomass measurements in the crop model AquaCrop
Biosystems Engineering
On Energy-Optimal and Time-Optimal Precise Displacement of Rigid Body with Friction
Journal of Optimization Theory and Applications, 2016
Ontogenic Plant Growth Modelling: Natural Selection and Optimal Control
gwri-ic.technion.ac.il
... 80 Page 5. The Hamiltonian, which according to PMP has to be maximized with respect to u and ... more ... 80 Page 5. The Hamiltonian, which according to PMP has to be maximized with respect to u and subject to the constraints, has the form H = px(1−u)kf(x)+pyuf(x)=[u(py −kpx)+kpx]f(x), 0 ≤ u ≤ 1, u·f(x) ≤ g(y). (3.2) ... S = py − kpx, (3.3) which is a coefficient of u in (3.2). ...
6th IFAC Symposium on Robust Control Design, 2009, 2009
In this paper a simplified isolated controlled intersection is introduced. A discreteevent max-pl... more In this paper a simplified isolated controlled intersection is introduced. A discreteevent max-plus model is proposed to formulate the optimization problem for the switching sequences. The formulated max-plus problem is converted to be solved by linear programming (LP). In the special case when the criterion is a strictly increasing and linear function of the queue lengths, the steady-state control problem can be solved analytically. In addition, necessary condition for the steady-state control is derived.
Acceptable Nitrate Concentration of Greenhouse Lettuce: An Optimal Control Policy for Temperature, Plant Spacing, and Nitrate Supply
IFAC Proceedings Volumes
Acceptable nitrate concentration of greenhouse lettuce: Two optimal control policies
Biosystems Engineering, 2002
Optimal spacing of a vegetative greenhouse crop
Acta Horticulturae, 1998
SE—Structures and Environment: Fitting the Nicolet Lettuce Growth Model to Plant-spacing Experimental Data
Biosystems Engineering, 2002
Hamilton-Jacobi-Bellman formalism for optimal climate control of greenhouse crop
Automatica a Journal of Ifac the International Federation of Automatic Control, May 1, 2009
Optimal Feedback Control for a Perimeter Traffic Flow at an Urban Region
2014 11th International Conference on Informatics in Control Automation and Robotics, Sep 1, 2014
Fitting the Nicolet lettuce growth model to plant-spacing experimental data
Biosystems Engineering, 2002
Problems of optimal control of cyclic processes
Soviet journal of computer and systems sciences
Neural networks for dynamical crop growth model reduction and optimization
Artificial Neural Nets and Genetic Algorithms, 1995
A dynamic crop growth model of undeterminate tomato variety (TOMGRO) consists of a large number (... more A dynamic crop growth model of undeterminate tomato variety (TOMGRO) consists of a large number (69) of difference equations that describe age classes of different organs. In order to find a fast working and low-dimensional equivalent with dynamic Neural Networks (NN), several model reduction approaches has been tried, including aggregation, PCA transformation, and bottleneck NN compression. Reduced data were used to train dynamic NN. Simulations with the NN model produced trajectories which agreed well with the original trajectories of TOMGRO.
Optimal CO2 Enrichment of Greenhouses in Mild Climates
Acta Horticulturae, 1997
Proceedings of the 11th International Conference on Informatics in Control, Automation and Robotics, 2014
Traffic flow control has motivated many researchers since early decades of the 19th century. Rece... more Traffic flow control has motivated many researchers since early decades of the 19th century. Recently, the concept of a perimeter traffic control for an urban region has been strengthened by a series of works, which have shown that a perimeter controller, located at a region border, can manipulate the transfer flows across the border to maximize the total outflow of the region. The macroscopic fundamental diagram (MFD), that relates average flow with accumulation, is used to model the traffic flow dynamics in the region. Assuming that the control inputs of the cross-border flows are coupled, i.e. the border is always utilized over time for transferring flows by one of the two directions (from and towards the region), and that the urban region has two traffic flow demands generated inside the region with internal and external destinations, and a generated traffic flow outside the region with a destination to the region, the explicit formulation of the optimal feedback control policy and a proof of optimality are provided. The proof is based on the modified Krotov-Bellman sufficient conditions of optimality, where the upper and lower bounds of state variables are calculated.
Optimal control of the rotation of an axisymmetric rigid body: the general case
Control applications of optimization 1995: a postscript …, 1996
Abstract The problem of an axisymmetric rigid body angular velocity vector maneuvering in the bod... more Abstract The problem of an axisymmetric rigid body angular velocity vector maneuvering in the body-fixed frame is considered. Control actuators are provided by two pairs of reactive jets with constant directions of their torques. Characteristics of these jets could be unequal. The time of the process of a transfer from the initial to the end point in the body-fixed frame of angular velocities is not prescribed. Both initial and end points could be arbitrary but given in advance. The problem is solved in the closed analytical form. Sufficient conditions of optimality are used.
On the botanic model of plant growth with intermediate vegetative-reproductive stage
Theoretical population biology, 2005
The application of dynamic optimization to mathematical models of ontogenic biological growth has... more The application of dynamic optimization to mathematical models of ontogenic biological growth has been the subject of much research [see eg Cohen, 1971. J. Theor. Biol. 33, 299307]. Kozłowsky and Ziółko [1988. Thor. Popul. Biol. 34, 118129] and Ziółko and ...
Combined time and energy optimal trajectory planning with quadratic drag for mixed discrete-continuous task planning
Optimization
Combined time and energy optimal trajectory planning with quadratic drag for mixed discrete-continuous task planning
Optimization
Assimilation of canopy cover and biomass measurements in the crop model AquaCrop
Biosystems Engineering
On Energy-Optimal and Time-Optimal Precise Displacement of Rigid Body with Friction
Journal of Optimization Theory and Applications, 2016
Ontogenic Plant Growth Modelling: Natural Selection and Optimal Control
gwri-ic.technion.ac.il
... 80 Page 5. The Hamiltonian, which according to PMP has to be maximized with respect to u and ... more ... 80 Page 5. The Hamiltonian, which according to PMP has to be maximized with respect to u and subject to the constraints, has the form H = px(1−u)kf(x)+pyuf(x)=[u(py −kpx)+kpx]f(x), 0 ≤ u ≤ 1, u·f(x) ≤ g(y). (3.2) ... S = py − kpx, (3.3) which is a coefficient of u in (3.2). ...
6th IFAC Symposium on Robust Control Design, 2009, 2009
In this paper a simplified isolated controlled intersection is introduced. A discreteevent max-pl... more In this paper a simplified isolated controlled intersection is introduced. A discreteevent max-plus model is proposed to formulate the optimization problem for the switching sequences. The formulated max-plus problem is converted to be solved by linear programming (LP). In the special case when the criterion is a strictly increasing and linear function of the queue lengths, the steady-state control problem can be solved analytically. In addition, necessary condition for the steady-state control is derived.
Acceptable Nitrate Concentration of Greenhouse Lettuce: An Optimal Control Policy for Temperature, Plant Spacing, and Nitrate Supply
IFAC Proceedings Volumes
Acceptable nitrate concentration of greenhouse lettuce: Two optimal control policies
Biosystems Engineering, 2002
Optimal spacing of a vegetative greenhouse crop
Acta Horticulturae, 1998
SE—Structures and Environment: Fitting the Nicolet Lettuce Growth Model to Plant-spacing Experimental Data
Biosystems Engineering, 2002
Hamilton-Jacobi-Bellman formalism for optimal climate control of greenhouse crop
Automatica a Journal of Ifac the International Federation of Automatic Control, May 1, 2009
Optimal Feedback Control for a Perimeter Traffic Flow at an Urban Region
2014 11th International Conference on Informatics in Control Automation and Robotics, Sep 1, 2014
Fitting the Nicolet lettuce growth model to plant-spacing experimental data
Biosystems Engineering, 2002